[InstCombine] add tests for loads of bitcasted vector pointer; NFC

llvm-svn: 362703

diff --git a/llvm/test/Transforms/InstCombine/load-bitcast-vec.ll b/llvm/test/Transforms/InstCombine/load-bitcast-vec.ll
new file mode 100644 (file)
index 0000000..e6540ee
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/load-bitcast-vec.ll
@@ -0,0 +1,90 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+define float @matching_scalar(<4 x float>* dereferenceable(16) %p) {
+; CHECK-LABEL: @matching_scalar(
+; CHECK-NEXT:    [[BC:%.*]] = getelementptr inbounds <4 x float>, <4 x float>* [[P:%.*]], i64 0, i64 0
+; CHECK-NEXT:    [[R:%.*]] = load float, float* [[BC]], align 16
+; CHECK-NEXT:    ret float [[R]]
+;
+  %bc = bitcast <4 x float>* %p to float*
+  %r = load float, float* %bc, align 16
+  ret float %r
+}
+
+define i32 @nonmatching_scalar(<4 x float>* dereferenceable(16) %p) {
+; CHECK-LABEL: @nonmatching_scalar(
+; CHECK-NEXT:    [[BC:%.*]] = bitcast <4 x float>* [[P:%.*]] to i32*
+; CHECK-NEXT:    [[R:%.*]] = load i32, i32* [[BC]], align 16
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %bc = bitcast <4 x float>* %p to i32*
+  %r = load i32, i32* %bc, align 16
+  ret i32 %r
+}
+
+define i64 @larger_scalar(<4 x float>* dereferenceable(16) %p) {
+; CHECK-LABEL: @larger_scalar(
+; CHECK-NEXT:    [[BC:%.*]] = bitcast <4 x float>* [[P:%.*]] to i64*
+; CHECK-NEXT:    [[R:%.*]] = load i64, i64* [[BC]], align 16
+; CHECK-NEXT:    ret i64 [[R]]
+;
+  %bc = bitcast <4 x float>* %p to i64*
+  %r = load i64, i64* %bc, align 16
+  ret i64 %r
+}
+
+define i8 @smaller_scalar(<4 x float>* dereferenceable(16) %p) {
+; CHECK-LABEL: @smaller_scalar(
+; CHECK-NEXT:    [[BC:%.*]] = bitcast <4 x float>* [[P:%.*]] to i8*
+; CHECK-NEXT:    [[R:%.*]] = load i8, i8* [[BC]], align 16
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %bc = bitcast <4 x float>* %p to i8*
+  %r = load i8, i8* %bc, align 16
+  ret i8 %r
+}
+
+define i8 @smaller_scalar_less_aligned(<4 x float>* dereferenceable(16) %p) {
+; CHECK-LABEL: @smaller_scalar_less_aligned(
+; CHECK-NEXT:    [[BC:%.*]] = bitcast <4 x float>* [[P:%.*]] to i8*
+; CHECK-NEXT:    [[R:%.*]] = load i8, i8* [[BC]], align 4
+; CHECK-NEXT:    ret i8 [[R]]
+;
+  %bc = bitcast <4 x float>* %p to i8*
+  %r = load i8, i8* %bc, align 4
+  ret i8 %r
+}
+
+define float @matching_scalar_small_deref(<4 x float>* dereferenceable(15) %p) {
+; CHECK-LABEL: @matching_scalar_small_deref(
+; CHECK-NEXT:    [[BC:%.*]] = getelementptr inbounds <4 x float>, <4 x float>* [[P:%.*]], i64 0, i64 0
+; CHECK-NEXT:    [[R:%.*]] = load float, float* [[BC]], align 16
+; CHECK-NEXT:    ret float [[R]]
+;
+  %bc = bitcast <4 x float>* %p to float*
+  %r = load float, float* %bc, align 16
+  ret float %r
+}
+
+define float @matching_scalar_volatile(<4 x float>* dereferenceable(16) %p) {
+; CHECK-LABEL: @matching_scalar_volatile(
+; CHECK-NEXT:    [[BC:%.*]] = getelementptr inbounds <4 x float>, <4 x float>* [[P:%.*]], i64 0, i64 0
+; CHECK-NEXT:    [[R:%.*]] = load volatile float, float* [[BC]], align 16
+; CHECK-NEXT:    ret float [[R]]
+;
+  %bc = bitcast <4 x float>* %p to float*
+  %r = load volatile float, float* %bc, align 16
+  ret float %r
+}
+
+define float @nonvector(double* dereferenceable(16) %p) {
+; CHECK-LABEL: @nonvector(
+; CHECK-NEXT:    [[BC:%.*]] = bitcast double* [[P:%.*]] to float*
+; CHECK-NEXT:    [[R:%.*]] = load float, float* [[BC]], align 16
+; CHECK-NEXT:    ret float [[R]]
+;
+  %bc = bitcast double* %p to float*
+  %r = load float, float* %bc, align 16
+  ret float %r
+}